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Formation of Colloidal Dispersions of Polymer Materials in Aqueous Media by Solvent Shifting

Yang, Zhengnan
http://rave.ohiolink.edu/etdc/view?acc_num=akron1399561414

Abstract Details

2014, Master of Science, University of Akron, Polymer Science.
Adding poor solvent for polymer in the polymer solution will lead to shift in solubility and eventually phase separation, which refers to the solvent-shifting process. During this process it has been observed that relatively uniform size of polymer particles are formed. The formation of these polymeric nanoparticles have been assumed to follow a well-known “Ouzo Effect” that was previously used to explain the formation of nanoparticles of small-molecule organic molecules. This is also referred to as homogeneous nucleation. This approach has been used by many research groups to prepare particles of different sizes using polymers such as poly (lactic acid), polystyrene, and poly (methyl methacrylate). However, the assumed homogeneous nucleation mechanism for the solvent-shifting process has not been proved with obvious evidences. In this research we have studied very dilute concentration of non-solvent to capture the early stages of concentration fluctuation and the formation of nucleation by dynamic light scattering. Small increasing of the scattering light together with 1~3 nm peak were observed at the early stage as adding water drop wise into PMMA/THF solution before PMMA nanoparticles were formed. Hypothesis and questions of the mechanism of the formation of polymer nanoparticle were carefully discussed in this article.
Ali Dhinojwala, Dr. (Advisor)
Abraham Joy, Dr. (Committee Member)
73 p.
Polymers

Recommended Citations

Citations

  • Yang, Z. (2014). Formation of Colloidal Dispersions of Polymer Materials in Aqueous Media by Solvent Shifting [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1399561414

    APA Style (7th edition)

  • Yang, Zhengnan. Formation of Colloidal Dispersions of Polymer Materials in Aqueous Media by Solvent Shifting . 2014. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1399561414.

    MLA Style (8th edition)

  • Yang, Zhengnan. "Formation of Colloidal Dispersions of Polymer Materials in Aqueous Media by Solvent Shifting ." Master's thesis, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1399561414

    Chicago Manual of Style (17th edition)

akron1399561414
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This open access ETD is published by University of Akron and OhioLINK.